Using a commercial software CD, Serial Network Flow Monitor (SNFM) monitors the payload local area network (LAN) to analyze and troubleshoot LAN data traffic. Validating LAN traffic models may allow for faster and more reliable computer networks to sustain systems and science on future space missions.Principal Investigator(s)
Boeing, Houston, TX, United States
National Aeronautics and Space Administration (NASA)Sponsoring Organization
Human Exploration and Operations Mission Directorate (HEOMD)Research Benefits
Information PendingISS Expedition Duration:
April 2004 - September 2014Expeditions Assigned
9,10,11,12,19/20,21/22,23/24,25/26,27/28,29/30,31/32,33/34,35/36,37/38,39/40Previous ISS Missions
SNFM is a continuing investigation which has been performed on ISS Expeditions 9 and 10.
The Serial Network Flow Monitor (SNFM) experiment attempts to characterize the network equivalent of traffic jams on board ISS. The SNFM team is able to specifically target historical problem areas including the SAMS (Space Acceleration Measurement System) communication issues, data transmissions from the ISS to the ground teams, and multiple users on the network at the same time. By looking at how various users interact with each other on the network, conflicts can be identified and work can begin on solutions.
SNFM is comprised of a commercial off the shelf software package that monitors packet traffic through the payload Ethernet LANs (local area networks) on board ISS.
Extends ISS accommodations to sub-rack payloads. Provides a set of standard interfaces and resources for sub-rack payloads. Supports the simultaneous and independent operations of multiple payloads within the rack. Accommodates multiple science disciplines.Earth Applications
Locating and correcting computer network problems may alleviate the data downlinking issues. This will provide the scientists on the ground with the data that is necessary for the analysis of the data for their experiments. Some of the results from these experiments may make significant improvements in many areas of human life.
A Commercial Off the Shelf software package is loaded from a CD-ROM to an EXPRESS rack laptop computer. SNFM ground personnel typically coordinate with other network users and/or the POIC to determine when the events they wish to monitor will occur. The SNFM investigation monitors only the medium rate data link (MRDL).Operational Protocols
Crew loads software onto an EXPRESS Laptop Computer (ELC) for Payload LAN monitoring. Files are downlinked by ground command. Operation of SNFM by the crew will require power up of the EXPRESS Laptop and activation of the selected SNFM Autocapture template. Once activated, SNFM will monitor the network and capture packet statistics until its buffer has filled.
SNFM data are still being analyzed, and will provide "lessons learned" for ongoing network operations on space station and future spacecraft systems. (Evans et al. 2009)